2^  per  cent  of  the  local  fauna  to  be  infected;  with  such  a  high 
nUortion  the  Glossina  should  also  show  a  correspondingly  high 
Urcentage  of  infectivity,  and  in  Zululand  this  apparently  obtained, 
for  no  failures  are  recorded.  That  this  high  ratio  of  infected  tsetse 
is  not  universal,  is  we  think  shown  by  the  manner  m  which  the 
cattle  already  mentioned  have  been  exposed  to  their  attacks  for 
considerable  periods  without  any  untoward  effects ;  unless  it  be 
assumed  that  a  very  latent  or  chronic  infection  had  resulte 
We  have  records  of  feeding  fifty-three  freshly-caught  Ghssim 
morsitans  on  a  dog  (22),  a  guinea-pig  (25)  and  a  white  rat  (  ),  none 
of  which  became  infected ;  and  no  natural  infections  have^  been 
recorded  by  workers  of  the  Sleeping  Sickness  Commission,  w  0 
used  large  mimbers  of  freshly-caught  Gl.  failles  and  Gl.  fuse. 
at  Nairobi.  The  suggestion  was  then  made  that  possibly  these  les 
had  lost  their  infectivity  during  the  period  elapsing  between  capture 
at  Kibwezi  and  feeding  at  Nairobi,  but  if  Kleine’s  recent  observa- 
tionst  are  to  be  substantiated  it  must  be  inferred  that  they  were 
non-infective  at  the  time  of  capture.  •  .t 
The  Loangwa  valley  down  w'hich  Mr.  Morkel  travelled  is  one 
the  best  shooting  districts  in  North-Eastern  Rhodesia,  being  very 
rich  in  game  of  all  local  species;  whilst  the  Kafue  river,  on  which 
were  situated  the  European  farm  and  Chinyamas  village,  w  ere  no 
cattle  mortality  occurs,  is  one  of  the  richest 
North-Western  Rhodesia,  and,  as  previously  reported,  game 
various  species  has  been  seen  grazing  with  the  stock. 
Quite  dissimilar  are  the  results  in  the  transport  cattle  taken 
,907'  from  Broken  Hill  to  Kansanshi,  where  all  the  >08 
on  this  250  mile  journey  died  within  two  months,  and  all  the  42  h 
sent  between  Broken  Hill  and  Ndola  also  succumbed.  This  lesuh 
also  occurred,  on  the  same  Ndola  road,  to  the  railway  survey  par  h 
who  lost  all  their  animals  in  .905-6  and  had  to  ^andon  h 
waggons,  and  to  Mr.  George  Grey's  party  proceeding  from  Kalomo 
to  Kansanshi  in  1902. 
Reference  has  been  made  in  our  ” 
experimental  animals  taken  by  us  between  Mwombosh.  and  B 
Hill  which  became  infected  after  three  Gl.  morslians^e^^^^ 
*  Reports  of  Sleeping  Sickness  Commission,  No.  V,  p.  4.'?- 
t  Kleine.  Dent.  med.  Woch.,  1909,  pp-  469-47®- 
